A Graph Tree Drawing Control for WPF

using System.Collections.Generic;
using System.Windows;
using System.Windows.Documents;
using System.Windows.Media;
using GraphLayout;

namespace TreeContainer
{
	public class TreeConnectionsAdorner : Adorner
	{
		#region Private variables
		TreeContainer _tc;
		#endregion

		#region Constructors
		static TreeConnectionsAdorner()
		{
		}

		public TreeConnectionsAdorner(UIElement adornedElement)
			: base(adornedElement)
		{
			_tc = adornedElement as TreeContainer;
			IsHitTestVisible = false;
		}
		#endregion

		#region Point Conversion
		Point PtFromDPoint(DPoint dpt)
		{
			return new Point(dpt.X, dpt.Y);
		}
		#endregion

		#region Rendering
		protected override void OnRender(DrawingContext drawingContext)
		{
			List<TreeConnection> lsttcn = _tc.Connections;
			if (lsttcn != null)
			{
				SolidColorBrush brsh = new SolidColorBrush(Colors.Black);
				brsh.Opacity = 0.5;
				Pen pen = new Pen(brsh, 1.0);
				Point ptLast = new Point(0, 0);
				bool fHaveLastPoint = false;

				base.OnRender(drawingContext);
				foreach (TreeConnection tcn in lsttcn)
				{
					fHaveLastPoint = false;
					foreach (DPoint dpt in tcn.LstPt)
					{
						if (!fHaveLastPoint)
						{
							ptLast = PtFromDPoint(tcn.LstPt[0]);
							fHaveLastPoint = true;
							continue;
						}
						drawingContext.DrawLine(pen, PtFromDPoint(dpt), ptLast);
						ptLast = PtFromDPoint(dpt);
					}
				}
			}
		}
		#endregion
	}
}